classic with some bomb proof handsets

gianaameri said:
If it works [and it is cheap], why change it !
Click to expand...

my thoughts at the time i built the first set.
i did look at other options but decided to stick with them.
most of the time the microswitches fail due to corrosion caused by water getting in thru cracks in the housing.
my theory was remove the crack issue with a more robust handset then the switches should give good service.
 
Angleseyskipper said:
yep i agree you need to look long and hard before changing any of the running gear.
yes the origional is a basic microswitch, but there might be a good reason for it apart from low cost :)
Click to expand...

The original housing cracks and leaks, but there might be a good reason for it ;)

The housing is an ambient pressure housing and the microswitch can corrode of the high humidity air from the loop. There are many cases of battery drain other problems caused by a corroded microswitch. I know one and it did not have cracks.

And about the reed switch bouncing.... doesn't almost all switches bounce if knocked hard enough. Just use a big resistor for FET pulldown and it will filter out bounces. The FET gate capacitance and a pulldown resistor makes a low pass filter. I newer use reed switches for current. I control FETs with them.
 
plazma said:
The original housing cracks and leaks, but there might be a good reason for it ;)

The housing is an ambient pressure housing and the microswitch can corrode of the high humidity air from the loop. There are many cases of battery drain other problems caused by a corroded microswitch. I know one and it did not have cracks.

And about the reed switch bouncing.... doesn't almost all switches bounce if knocked hard enough. Just use a big resistor for FET pulldown and it will filter out bounces. The FET gate capacitance and a pulldown resistor makes a low pass filter. I newer use reed switches for current. I control FETs with them.
Click to expand...

Interesting to hear that components other than trimmers, potentiometers, and capacitors suffer inside a non 1 ATA case (and conformal coating cannot protect a microswitch either).

However, the reed switch at least is sealed, while the microswitch is not (I suspect the microswitch would be more robust and resilient to a knock because the contacts are mechanically separated, while on a reed switch they are just apart, but loose).

Do you have a picture or schematic with part numbers of your solution (big resistor on FET...)?
 
Angleseyskipper said:
Bit of an update i'm going to start on drawings for side entry handsets using similar retrofit but a lot easier to machine as it will be rectangular .
delrin billet housing ,lexan screem and delrin top plate with usual mag sliiders.
switch will have to be moved.
Click to expand...

Hi, did anything ever come of this?
 
no sorry ,my M8 has lost intrest in CCR and mine is working model so no real drive to push forward.
done very little time on CCr this year meself.
spent most of this season in 8m max on Hooka scuba and pumped 40degree hot water wetsuit lovely and toastie.
a 4hr dive twice a day is about average.
personally i now think drysuits are poo :)
 
Last edited:
Angleseyskipper said:
no sorry ,my M8 has lost intrest in CCR and mine is working model so no real drive to push forward.
done very little time on CCr this year meself.
spent most of this season in 8m max on Hooka scuba and pumped 40degree hot water wetsuit lovely and toastie.
a 4hr dive twice a day is about average.
personally i now think drysuits are poo :)
Click to expand...

Are you now a gold diver? :D

Sent from my GT-I9300 using Tapatalk
 
You must log in or register to reply here.
Back
Top